The UWSP Library uses the Library of Congress (LC) classification system to shelve most books. The classification system is designed to group library materials of similar subject concentration together.
The Library of Congress call number system is an alpha-numeric system. To read the call number, simply note the first letter or letters of the call number. "LA" would be shelved before "LB", "LC" before "LD", etc. Numbers follow the initial letter or letters. These numbers are read as whole numbers. A call number of "LA2" will be shelved before "LA4."
Here is a sample of how to read call numbers line by line:
http://www.bpl.org/general/callnumbers.htm